Coffee genotypes morphophysiological adaptation under coffee leaf rust biotic stress

Authors

DOI:

https://doi.org/10.25186/.v16i.1949

Abstract

The identification of morphophysiological traits responsible for a better plant behavior when infected is useful for cultivar selection, and become crucial for breeding. We investigated the morphophysiological behavior of coffee genotypes before and after inoculation with the pathogen Hemileia vastatrix, causal agent of coffee rust. With multivariate techniques we identified the characteristics that most contribute to total genetic divergence of the genotypes. Ten genotypes of Coffea arabica from the Germplasm Bank of Coffee from Minas Gerais were sown in a nursery and then take to a greenhouse with controlled temperature and humidity. After one month of acclimatization, the artificial inoculation with the fungus H. vastatrix was carried out. The anatomical and physiological evaluations were performed 1 day before inoculation and 160 days after inoculation. When the first symptom emerged, plants were evaluated according to a descriptive scale for coffee rust. We observed significant differences in rust severity and ostiole opening between
genotypes. Different groups were formed by the K-means method, based on morphophysiological characteristics. This shows that genetic variability exists between the coffee genotypes evaluated before and after inoculation with the pathogen. The most important characteristics that contributed to the total genetic divergence were xylem vessel diameter and stomatal conductance. In conclusion, inoculation with H. vastatrix caused a change in coffee genotypes based on morphophysiological characteristics.

Key words: Coffea arabica; canonical variables; Hemileia vastatrix.

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Published

2022-02-18

How to Cite

VIANA, M. T. R.; AZEVEDO, H. P. A. de; PEREIRA, F. A. C.; CARVALHO, M. A. de F. .; GUIMARÃES, R. J. . Coffee genotypes morphophysiological adaptation under coffee leaf rust biotic stress. Coffee Science - ISSN 1984-3909, [S. l.], v. 16, p. e161949, 2022. DOI: 10.25186/.v16i.1949. Disponível em: http://www.coffeescience.ufla.br/index.php/Coffeescience/article/view/1949. Acesso em: 30 sep. 2022.